[IMPALA-7772] Print message when open file limit restricts size of file handle cache

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Impala 3.1.0
• Component/s: Backend
• Epic Color: ghx-label-2
• Assignee: Joe McDonnell
• Reporter: Joe McDonnell
• Created: 26/Oct/18 17:14
• Updated: 30/Oct/18 23:26

Description

The size of the file handle cache is determined by the min(max_cached_file_handles, OS limit on number of open files). Right now, there is no message printed if the OS limit on the number of open files is less than max_cached_file_handles. This is confusing, because the file handle cache will be smaller than expected. We should print a message on startup in this case.